JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Liupeng Pan,Shunli Liu,Xiaolu Zhang,Olayinka Oderinde,Fang Yao,Guodong Fu
We report a kind of dopant (Eu 2+ ) and co-dopant (Dy 3+ ) co-doped strontium magnesium silicate phosphor synthesized via microwave irradiation in a weak reductive atmosphere of active carbon. X-ray diffraction (XRD) patterns illustrated that the samples were nearly pure Sr 2 MgSi 2 O 7 phase, in which the Sr 2 MgSi 2 O 7 host phase has the maximum fraction of tetragonal crystallography Sr 2 MgSi 2 O 7 phase. A series of long afterglow luminescent materials were synthesized to investigate the best synthetic conditions. The results showed that the optimal concentration of H 3 BO 3 and the best sintering time were 5 wt% and 30 min, respectively. The phosphors made from the microwave irradiation method demonstrated excellent luminescence performance and the microwave irradiation method provide a strategy for the synthesis of other alkali earth aluminate and silicate, or other luminescent materials.
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JOURNAL OF POWER SOURCES
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2017
·
IF 6.395
Kening Sun,Jia Liu,Jie Feng,Hong Yuan,Minjie He,Chunming Xu,Zhenhua Wang,Wang Sun,Jinshuo Qiao
B-site substituted Sr 2 Fe 1.4 X 0.1 Mo 0.5 O 6-δ (SFXM, X = Bi, Al and Mg) are evaluated as anode materials for hybrid direct carbon fuel cells (HDCFCs). The structure, morphology, conductivity and catalytic activity of the as-prepared SFXM anode are systematically investigated. Under a reducing atmosphere, the exsolution of metallic Fe from the SFXM perovskite lattice are demonstrated by the XRD , SEM and TEM observations. Further element valence analysis on reduced SFXM suggests the X doping significantly alters the Fe 3+ /Fe 2+ and Mo 6+ /Mo 5+ ratio, and thus beneficial to the intrinsic conductivity of SFXM. All these advantages are responsible for the good electrochemical performances of SFXM anodes. Meanwhile, among these SFXM anodes, the conductivity, catalytic activity and electrochemical performance all obey the order of SFBM > SFAM > SFMM. The maximum power densities of the La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3 electrolyte supported single cell with SFBM as the anode reaches 399, 287 and 141 mW cm −2 at 800 °C, 750 °C and 700 °C, respectively. Such designed B-site substitution perovskites have great potential to be applied as HDCFC anode materials.
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ACS Nano
·
2017
·
IF 13.942
Guodong Zou,Qingrui Zhang,Carlos Fernandez,Gang Huang,Jianyu Huang,Qiuming Peng
Rational design of heterogeneous electrode materials with hierarchical architecture is a potential approach to significantly improve their energy densities. Herein, we report a tailored microwave-assisted synthetic strategy to create heterogeneous hierarchical Ti3SiC2@C-containing Na2Ti7O15 (MAX@C-NTO) composites as potential anode materials for high-performance sodium storage in a wide temperature range from 25 to 80 °C. This composite delivers first reversible capacities of 230 mAh g–1 at 200 mA g–1 and 149 mAh g–1 at 3000 mA g–1 at 25 °C. A high capacity of ∼93 mAh g–1 without any apparent decay even after more than 10 000 cycles is obtained at an ultrahigh current density of 10 000 mA g–1. Moreover, both a high reversible capacity and an ultralong durable stability are achieved below 60 °C for the same composites, wherein a 75.2% capacity retention (∼120 mAh g–1 at 10 000 mA g–1) is achieved after 3000 cycles at 60 °C. To the best of our knowledge, both the sodium storage performances and the temperature tolerances outperform those of all the Ti-based sodium storage materials reported so far. The superior sodium storage performances of the as-synthesized composites are attributed to the heterogeneous core–shell architecture, which not only provides fast kinetics by high pseudocapacitance but also prolongs cycling life by preventing particle agglomeration and facilitates the transportation of electrons and sodium ions by large micro/mesopore structure.
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Advanced Materials Interfaces
·
2017
·Vol. 4
·期 24
·1700855
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IF 4.279
Nousheen Iqbal,Xianfeng Wang,Aijaz Ahmed Babar,Jianhua Yan,Jianyong Yu,Soo-Jin Park,Bin Ding
High performance lightweight and flexible supercapacitors with superior electrochemical performance are in extremely high demand for wearable electronic device applications. Herein, a novel synthesis process is reported for developing highly flexible supercapacitor electrodes from carbon black doped carbon nanofiber/polyaniline core–shell nanofibers via electrospinning followed by carbonization and electrospray techniques. Resultant supercapacitor electrodes offer exceptional specific capacitance (SC) of 501.6 F g −1 at 0.5 A g −1 , excellent capacitance retention of 91% even after 5000 cycles, demonstrating a long and stable life of the fabricated device. Moreover, solid state supercapacitor shows no obvious change in SC when subjected to various bending angles up to 180°. This simple three step (i.e., electrospinning, carbonization, and electrospray) fabrication technique paves new insights into the development of lightweight flexible supercapacitors.
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International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Shuaijun Yang,Mei Wang,Yetong Lv,Huilin Sheng,Yexia Qin
Oxidation resistance is crucial to the potential applications of high-entropy carbides (HECs) at elevated temperatures. Here, we realize the exploration of (Hf, Ta, Zr, Cr)C high-entropy carbides (HEC-TM, TM = Hf, Zr, Ta, and Cr) with good oxidation resistance by optimizing their compositions. To be specific, 21 kinds of HEC- x TM ( x = 0–25 mol%) samples are fabricated by a high-throughput ultrafast high-temperature sintering technique, followed by oxidation testing at 1673 K for 30 min. Among all the HEC samples, the as-fabricated HEC-0Zr samples are proved to possess the best oxidation resistance with an oxidation depth of only 53 µm. Further study on isothermal oxidation kinetics demonstrates that the as-fabricated HEC-0Zr samples follow a linear oxidation law. The good oxidation resistance of the as-fabricated HEC-0Zr samples is believed to result from the (Ta, Me) 2 O 5 phase with a low melting point, which can promote the densification of the oxide layer. This research opens up a new way for efficiently discovering new HECs for extreme applications.
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ELECTROCHIMICA ACTA
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2024
·
IF 5.5
Xiaoqi Song,Xiping Lei,Tian Tian,Ting Yu,Hang Zhu,Zewei Zhang,Gengwei Li,Xuanhong Xu,Zhiqiang Wang
Lithium metal anode is broadly regarded as one of the most promising anode materials for batteries due to its extremely high specific capacity, very low redox potential, and mass density. Nevertheless, non-uniform deposition of lithium ions hinder the practical application of lithium metal batteries (LMBs). Herein, it was essential to design a separator with high electrolyte affinity to inhibit the non-uniform deposition of lithium ions. In this work, the wettability and electrolyte uptake of the polypropylene (PP) separator were remarkably improved by introducing reduced graphene oxide (rGO) and polyvinylidene fluoride (PVDF) to the surface of the separator through one-sided coating. The composite separator resulted in lithium ion with high conductivity (1.35 × 10 –3 S cm -1 ) and transfer number (0.63). After assembling the rGO/PVDF@PP separator into the LiFePO 4 ||Li battery and conducting the test, it was found that the specific discharge capacity could still reach 136 mAh g -1 after 100 cycles at 1C. Furthermore, After 1000 h of cycling in the assembled Li‖Li symmetric battery, there is no obvious generation of lithium dendrites on the surface of the lithium metal, indicating the successful suppression of lithium dendrites by the composite separator. This study offers a promising pathway for producing large quantities of new composite separators with high levels of safety.
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Journal of Energy Storage
·
2024
·
IF 8.9
Xinpu Zhou,Shuang Wang,Guangpeng Ma,Wenyu Bai,Xianfeng Guan,Cuicui Li,Wanzhen Wu,Shuyu Zhang
Two-dimensional material MXene (Ti 3 C 2 T x ) with multilayer structures is widely used in supercapacitors , but their structures tend to pile up and limit their performance. Therefore, a strategy is provided to synthesize the random copolymer aniline- co -pyrrole (ANPY) by in-situ polymerization of aniline and pyrrole on the MXene. The self-stacking of MXene materials can be prevented, and ANPY can be used as the intermediate layer to modulate MXene nanosheets forming more ion migration channels, which can improve the electrochemical performance of ANPY/MXene. MXene is used as a “backbone” for ANPY to adjust the chain space configuration of polymer molecules. The prepared ANPY/MXene electrodes have a high specific capacitance of 451.75 F/g increasing by 39 % on the original PANI electrode. PVA/MXene gel electrolyte and ANPY/MXene electrode are assembled to form a flexible supercapacitor capable of 91.8 % capacitance retention after 5000 cycles. It suggests that the ANPY/MXene material provides a new idea for preparing supercapacitors with good electrochemical performance.
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Matter
·
2024
·
IF 17.3
Youbing Li,Shuairu Zhu,Jia-Bo Le,Jun Lu,Xue Wang,Lu Chen,Haoming Ding,Ke Chen,Mian Li,Shiyu Du,Hui Wang,Runnan Zhang,Per O.Å. Persson,Lars Hultman,Per Eklund,Yongbo Kuang,Zhifang Chai,Qing Huang
M n+1 AX n (MAX) phases have attracted significant attention due to their structural diversity and potential applications. Designing MAX phases with single-atom-thick A layers featuring 4d/5d-orbital electronic elements is interesting work. Here, we present a comprehensive report on noble metal-based M 2 (A 1- x A′ x )C (M = V, Ti, Nb; A = Al, Sn, In, Ga, Ge; A′ = Ru, Rh, Pd, Ir, Pt, Au and combinations thereof; 0 < x ≤ 0.4) phases featuring A sublayers of 4d/5d-orbital electronic elements through an A-site alloying strategy. The chemical composition of MAX phases can be adjusted by selecting different M- and A-site elements, with morphology tailored by distinct C sources. Furthermore, the V 2 (Sn 0.8 Pt 0.2 )C (15.7 wt % Pt) catalyst showed better performance for hydrogen evolution reaction compared to the commercial Pt/C (20 wt % Pt) electrode. This study highlights the prospects of A-site alloying for the design of novel MAX phases with unique properties and promising applications in electrocatalysis and beyond.
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MOLECULES
·
2024
·Vol. 29
·期 6
·1362
·
IF 4.2
Zisheng Shi,Wei Chen,Yin Hu,Fen Zhang,Lingling Wang,Dan Zhou,Xuanye Chen,Sugang Meng
In recent years, oxygen vacancy (VO) engineering has become a research hotspot in the field of photocatalysis. Herein, an efficient GQDs/BiOCl-VOheterojunction photocatalyst was fabricated by loading graphene quantum dots (GQDs) onto BiOCl nanosheets containing oxygen vacancies. ESR and XPS characterizations confirmed the formation of oxygen vacancy. Combining experimental analysis and DFT calculations, it was found that oxygen vacancy promoted the chemical adsorption of O2, while GQDs accelerated electron transfer. Benefiting from the synergistic effect of oxygen vacancy, GQDs, and dye sensitization, the as-prepared GQDs/BiOCl-VOsample exhibited improved efficiency for RhB degradation under visible-light irradiation. A 2 wt% GQDs/BiOCl-VOcomposite effectively degraded 98% of RhB within 20 min. The main active species were proven to be hole (h+) and superoxide radical (·O2−) via ESR analysis and radical trapping experiments. This study provided new insights into the effective removal of organic pollutants from water by combining defect engineering and quantum dot doping techniques in heterojunction catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Fang Liu,Dazhi Gao,Fangqing Wang,Pengcheng Shen,Yang Liu,Shiqing Zhang,Ying Li,Jun Zhang,Yanming Xue,Chengchun Tang
The electrocatalytic oxygen reduction reaction (ORR) is crucial for energy conversion systems such as fuel cells and metal-air batteries . Boron carbon nitrogen (BCN) is a novel functional material with a high specific surface area , excellent corrosion resistance , and outstanding electrochemical stability. These properties make BCN an effective ORR catalyst and a promising support for metal catalysts . This study leveraged the strong interaction between BCN and metals to anchor platinum nanoparticles (Pt NPs) onto the BCN surface (Pt/BCN), significantly enhancing the durability of traditional Pt/C catalysts in ORR. The half-wave potential of Pt/BCN is 0.927 V, higher than Pt/XC-72R (0.857 V) and commercial Pt/C (0.879 V). Notably, after 10,000 durability test cycles, the mass activity (MA) of Pt/XC-72R and commercial Pt/C decreased by 67 % and 75 %, respectively. Even after 50,000 cycles, Pt/BCN exhibited only a 54 % decrease in MA. Experimental data and density functional theory calculations confirmed increased electron transfer from Pt to the BCN support, indicating a strong electronic metal-support interaction (EMSI) between Pt and BCN. This strong EMSI effectively anchored the Pt NPs, preventing migration and aggregation during the ORR process. Consequently, our research introduces a novel electrocatalyst support material with significant potential for ORR and broader applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Dongya Ma,Shuzhi Yan,Xinru Xue,Miao Niu,Hongliang Li,Deyu Bao,Chao Zhao,Xiujun Li,Peng Wang,Rong Li,Lei Huang,Miao Yu,Sitong Jia,Yanjiao Wang,Xiao Li,Zhen Zhang,Tie Wang
Hydrogen-bonded organic frameworks (HOFs) become promising candidates in the capacitive deionization (CDI) technology due to their prominent redox reaction. Herein, the novel CNTs@HOF-DAT composite with the three-dimensional interwoven-network structure is prepared by the facile solvothermal synthesis and applied to the CDI technology for the first time. The synergistic effect between the special structure of HOF-DAT (multiple hydrogen bonds, abundant heteroatoms and π-π interactions) and the high conductivity of CNTs stimulates more redox active sites for the ion storage and accumulation in the CNTs@HOF-DAT composite. This makes the CNTs@HOF-DAT electrode have a high specific capacitance (152.5 F∙g −1 ) and an improved pseudo-capacitance contribution (49 %). Also, the ion removal capacity (16.33 mg∙g −1 ) of the CNTs@HOF-DAT electrode greatly surpasses that of the single HOF-DAT electrode (3.23 mg∙g −1 ) and CNTs electrode (8.77 mg∙g −1 ). Significantly, the desalination mechanism of the CNTs@HOF-DAT composite electrode is explored in terms of the electrode configurating mode and zero-charge potential of the three prepared electrodes, as well as the redox reaction of the HOF-DAT molecules, which manifests that the CNTs@HOF-DAT electrode is suitable as the cathode of the CDI cell.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Minglong He,Junjie Shi,Anyu Zhang,Yuying Xu,Qing Wu,Li Wen,Qi Hong,Yang Yue,Siliang Wang
The plentiful and renewable nature of iodine confers metal-iodine batteries (MIBs) a benefit in the advancement of energy storage technology with high energy and power densities. However, dendrite growth and susceptibility to electrolyte corrosion not only result in low anode utilization but also severely affect battery stability. This paper introduces an ammonium-iodine batteries (AIBs) structure that leverages the inertness of organic materials to iodide ions, thereby avoiding the electrolyte corrosion issues commonly found in the metal anodes of traditional MIBs. Additionally, the use of a non-metallic anode eliminates the impact of dendrite growth on battery stability and increases the anode utilization rate. Because of these features, AIBs attain a high specific capacity of 242mAh g −1 and preserve an 80.7 % capacity retention rate following approximately 2000 cycles at a current density of 10 A g −1 . We have also developed micro batteries and pouch cells to verify the feasibility of the structure. This work provides an innovative strategy for iodine batteries energy storage system.
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